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PSY 225
PSY 225
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1
For a single-sample
t
test with 10 participants, the degrees of freedom are
10
7
9
8
2
Question below:
b
a
d
c
3
A tally sheet on which attributes that will not change are recorded is _____ item.
narrative
non-narrative
action
static
4
Below:
a
d
b
c
5
Q:
c
a
d
b
6
Z
cv
for a one-tailed test is _____ whereas Z
cv
for a two-tailed test is _____.
.05; .01
± 1.645; ±1.96
.01; .05
±1.96; ±1.645
7
Q:
b
d
c
a
8
Question below"
d
b
a
c
9
Q:
a
b
d
c
10
Directional hypothesis is to non-directional hypothesis as _____ hypothesis is to _____ hypothesis.
two-tailed; one-tailed
alternative; null
null; alternative
one-tailed; two-tailed
11
Inferential statistics allow us to
infer something about the sample based on the population.
all of the options are correct
infer something about the population based on the sample.
infer that the sample is representative.
12
A parametric inferential statistical test for a single sample where the population variance is known is the
t test
standard deviation.
standard error test.
z test.
13
The standard error of the mean will always be ____ the standard deviation for a distribution of individual scores
larger than
smaller than
the same as
the same as or larger than
14
Chi-square is calculated by summing the[(_____ - _____)
2
divided by _____].
observed; expected; observed
observed; observed; expected
expected; observed; observed
observed; expected; expected
15
One- and two-tailed hypotheses are both types of _____ hypotheses.
alternative
null
directional
non-directional
16
What is the probability of rolling an even number in a single roll of a die?
.25
.17
.50
.36
17
What is the standard error of the mean for a distribution of scores where sd = 15 and
n
= 100?
1.5
.15
cannot determine
15
18
Q below:
d
b
a
c
19
Studies in which the participants are aware that the researcher is observing their behavior utilize _____ observation
disguised
participant
undisguised
nonparticipant
20
Test of the null hypothesis for a single sample where the population variance is not known is the
t-test
z-test
standard error of the mean
Cohen's d
21
A false alarm is to a(n) _____ as a miss is to a(n) _____.
alternative hypothesis; null hypothesis
null hypothesis; alternative hypothesis
Type I error; Type II error
Type II error; Type I error
22
See picture:
a
c
b
d
23
Which of the following is not an assumption of the
t
-test?
The data should be ordinal or nominal.
The population mean (m) is known.
The sample size is typically less than 30.
The population distribution of scores should be symmetrical.
24
Researchers often prefer _____ observation because it increases _____ validity.
naturalistic; content
naturalistic; ecological
laboratory; construct
laboratory; ecological
25
What is the probability of pulling a heart from a standard (52-card) deck of playing cards?
1.0
.51
.75
.25
26
The influence of the researcher’s expectations on the outcome of the study refers to
expectancy effects.
reactivity
ecological validity.
both reactivity and expectancy effects.
